package com.sky.service.impl;


import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
@Slf4j
public class ShoppingCartServiceImpl implements ShoppingCartService {
    //注入ShoppingCartMapper
    @Autowired
    private ShoppingCartMapper shoppingCartMapper;

    //注入DishMapper
    @Autowired
    private DishMapper dishMapper;

    //注入SetmealMapper
    @Autowired
    private SetmealMapper setmealMapper;
    /**
     * 添加购物车
     * @param shoppingCartDTO
     */
    @Override
    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        //创建购物车对象
        ShoppingCart shoppingCart = new ShoppingCart();
        //将shoppingCartDTO对象中的数据赋值给shoppingCart对象
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);

        //只能查询自己的购物车数据  设置用户id
        shoppingCart.setUserId(BaseContext.getCurrentId());

        //判断当前商品是否在购物车中
        //通过shoppingCartMapper接口查询购物车中的数据
        List<ShoppingCart> shoppingCartList = shoppingCartMapper.list(shoppingCart);


        if(shoppingCartList != null && shoppingCartList.size() == 1){
            //如果购物车不为空 则商品数量加1
            shoppingCart = shoppingCartList.get(0);
            shoppingCart.setNumber(shoppingCart.getNumber()+1);//数量加一
            shoppingCartMapper.updateNumberById(shoppingCart);
        }else {
            //判断当前添加到购物车的是菜品还是套餐
            //获取到添加到购物车的菜品id 如果是菜品
            Long dishId=shoppingCartDTO.getDishId();
            //判断是否是菜品 则添加至购物车 并设置菜品名字、图片、还有添加的数量
            if (dishId != null){
                Dish dish=dishMapper.getById(dishId);
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());
            }else {
              //添加到购物车的是套餐
              //获取套餐 并设置信息
                Setmeal setmeal = setmealMapper.getById(shoppingCartDTO.getSetmealId());
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());
            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.insert(shoppingCart);
        }
    }

    /**
     * 查看购物车
     * 此方法用于获取当前用户购物车中的所有商品信息
     * 它通过调用shoppingCartMapper的list方法，传入当前用户的ID作为参数，以获取购物车列表
     *
     * @return 返回一个包含当前用户购物车中所有商品的列表
     */
    @Override
    public List<ShoppingCart> showShoppingCart() {
        return shoppingCartMapper.list(ShoppingCart
                .builder()
                .userId(BaseContext.getCurrentId())
                .build());
    }


    /**
     * 清空购物车
     */
    @Override
    public void cleanShoppingCart() {
        shoppingCartMapper.deleteByUserId(BaseContext.getCurrentId());
    }


    /**
     * 删除购物车中的单条数据
     * @param shoppingCartDTO
     */
    @Override
    public void subShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        //创建一个ShoppingCart对象，用于封装购物车数据
        ShoppingCart shoppingCart = new ShoppingCart();
        //将shoppingCartDTO对象中的数据赋值给shoppingCart对象
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        //设置查询条件，查询当前登录用户的购物车数据
        shoppingCart.setUserId(BaseContext.getCurrentId());

        //调用list方法查询购物车数据
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);

        //判断当前用户购物车是否有数据
        if(list != null && list.size() > 0){
            shoppingCart = list.get(0);

            Integer number = shoppingCart.getNumber();
            if(number == 1){
                //当前商品在购物车中的份数为1，直接删除当前记录
                shoppingCartMapper.deleteById(shoppingCart.getId());
            }else {
                //当前商品在购物车中的份数不为1，修改份数即可
                shoppingCart.setNumber(shoppingCart.getNumber() - 1);
                shoppingCartMapper.updateNumberById(shoppingCart);
            }
        }
    }
}
